Two planes leave an airport at the same? time, one flying? east, the other flying west. the eastbound plane travels 90 mph slower. they are 3480 mi apart after 4hr. find the speed of each plane.

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?